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One of the most promising ways of bringing localization services to GPS denied areas is the use of wireless sensor networks. For time difference of arrival (TDOA) systems, the achievable accuracy highly depends on the synchronization accuracy between the sensor nodes. In this paper we describe a new algorithm that achieves an ultra-precise wireless frequency synchronization using OFDM signals. Especially...
The most promising way of bringing localization services to GPS denied areas is the use of wireless sensor networks. The attainable accuracy for many methods of localization is highly depending on the synchronization between the sensor nodes. In this paper we describe a concept of adjusting the frequency of the local clocks with the help of signals of opportunity. It is explained, how broadcast signals...
Due to an increase of timing requirements in many actual and future applications, improvements are needed in current synchronization protocols. New scenarios as the Internet of Things or the next generation of 5G Mobile telecommunication networks, where a large number of devices must be interconnected, will stand in need of a better synchronization accuracy and a highly scalable protocol. White Rabbit...
Synchronization of a Wireless Sensor Network is a crucial task and is based on a precise syntonization of all clocks within the network. The synchronization precision is usually closely connected to the positioning accuracy in networks for the purpose of localization. This paper introduces a concept, how the clocks of low-complexity stationary receivers can be adjusted to the same frequency with the...
Various applications require or can benefit from high accuracy of synchronization between networked elements. The White Rabbit (WR) project includes enhancements to the now widespread IEEE1588 Precision Time Protocol (PTP) to support supplying synchronization in the sub-nanosecond level.
In this paper, we propose a new generation of time and frequency transfer system using Global Navigation Satellite System (GNSS) dual frequency receiver for the purpose of both time and frequency synchronization. The system can be used as a timing source, remote time and frequency calibration, and to monitor the characteristic of the telecommunication primary reference clocks (PRC). A series of experiments...
This standard defines a protocol and procedures for the transport of timing over bridged and virtual bridged local area networks. It includes the transport of synchronized time, the selection of the timing source (i.e., best master), and the indication of the occurrence and magnitude of timing impairments (i.e., phase and frequency discontinuities).
In industrial applications is a demand for the highly reliable and synchronous distributed systems. The problem is that in those systems the nodes maintain their own time using local clocks. This behavior can be suppressed by synchronization of the individual nodes. It is more effective to use GPS for synchronization in large distributed systems. This paper deals with evaluation of reachable accuracy...
This corrigendum to IEEE Std 802.1AS - 2011 corrects minor errors, bugs, ambiguities, and inconsistencies that were missed when the document was balloted. It does not contain new material.
A new remote time and frequency calibration system using Global Positioning System (GPS) common-view or all-in-view method for the purpose of time synchronization and frequency syntonization is presented. The system integrates GPS timing receiver with measurement hardware and software. It can be used as Primary Reference Clock (PRC), remote time and frequency calibration, and monitoring the characteristic...
This standard defines a protocol and procedures for the transport of timing over bridged and virtual bridged local area networks. It includes the transport of synchronized time, the selection of the timing source (i.e., best master), and the indication of the occurrence and magnitude of timing impairments (i.e., phase and frequency discontinuities).
This standard defines a protocol and procedures for the transport of timing over Bridged and Virtual Bridged Local Area Networks. It includes the transport of synchronized time, the selection of the timing source (i.e., best master), and the indication of the occurrence and magnitude of timing impairments (i.e., phase and frequency discontinuities).
The Precision Time Protocol (PTP) is an application layer protocol and therefore destined to be implemented in software. Hardware functions, if present, include a high resolution clock that helps to generate precise timestamps for PTP messages. The presented paper describes an IEEE 1588 clock that realizes syntonization and synchronization functions completely in hardware. It combines a three-port...
The purpose of this paper is to develop a low-cost, highly-accurate and real-time syntonization system composed of a single-frequency receiver with GPS carrier phase. For averaging time of one day under the configuration, our experimental results showed that the accuracy of the steered clock could be improved from about two parts in 109 to about three parts in 1014, and the stability of the syntonized...
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